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  1. Caesar Cipher
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Caesar Cipher

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238 Discussions

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  • lulski
     + 0 comments

    a breath of fresh air from the confusing af tower breakers.

  • mcoroz96
     + 0 comments

    c++

    string caesarCipher(string s, int k) {
    std::string result;

    for(char c : s){
        if(c >= 'A' && c <= 'Z'){
            result += ('A') + (c - 'A' + k)%26;
        }
        else if(c >= 'a' && c <= 'z'){
            result +=  ('a') + (c - 'a' + k)%26;
        }
        else{
            result+=c;
        }
    }
    return result;
}

  • iamkapy
     + 0 comments

    C++

    string caesarCipher(string s, int k) {
    string alphabet = "abcdefghijklmnopqrstuvwxyz";
    int shift = k % alphabet.size(); // k % 26
    string rotated_alphabet = alphabet.substr(shift) 
                            + alphabet.substr(0, shift);
    
    string result;
    for (const char& c : s) {
        if (!std::isalpha(c)) {
            result += c;
        } else {
            char ec = rotated_alphabet[std::tolower(c) - 'a'];

            if (std::isupper(c)) {
                ec = std::toupper(ec);
            }
            
            result += ec;            
        }
    }
    
    return result;
}

  • terrymayone
     + 0 comments

    Here is a Javascript solution

    function caesarCipher(s, k) {
    // Write your code here
    k = k % 26
    let encrypted =""
    
    for(let i =0; i < s.length; i++){
        let char  = s[i]
        
        // Check if the character is a letter
        if(char >= 'a' && char <= 'z'){
            // Shift lowercase letters
            let newChar = String.fromCharCode( ( (char.charCodeAt(0) - 97 + k) % 26) + 97)
            
            encrypted += newChar
        } else if(char >= 'A' && char <= 'Z'){
            let newChar = String.fromCharCode( ( (char.charCodeAt(0) - 65 + k) % 26) + 65)
            
            encrypted += newChar
        } else {
            encrypted += char
        }
    }
    return encrypted
}

  • vinimadureira
     + 0 comments

    C++11

    string caesarCipher(string s, int k) {

    string enc = "";
    char salt = k % 26;
    int next;

    for (char c : s) {
  
        next = c + salt;

        if (c > 64 && c < 91) {

            c = next < 91 ? next : next - 26;

    
        } else if (c > 96 && c < 123) {

            c = next < 123 ? next : next - 26;

        }

        enc += c;

    }
    
    return enc;

}